import React from 'react'
import { Outlet , NavLink  , useNavigate} from 'react-router-dom'

export default function Main() {
  const navigate = useNavigate()

  return (
    <div>
      <div className="row">
        <div className="col-xs-offset-2 col-xs-8">
          <div className="page-header"><h2>React Router Demo</h2></div>
          <button onClick = {()=>{ navigate(1) }}>前进</button>
          <button onClick = {()=>{ navigate(-1) }}>后退</button>
        </div>
      </div>
      <div className="row">
        <div className="col-xs-2 col-xs-offset-2">
          <div className="list-group">
            <NavLink className="list-group-item" to="/main/about" >about</NavLink>
            <NavLink className="list-group-item" to="/main/home" >home</NavLink>
          </div>
        </div>
        <div className="col-xs-6">
          <div className="panel">
            <div className="panel-body">
             <Outlet/>
            </div>
          </div>
        </div>
      </div>
    </div>
  )
}
